The hearing comes almost a year after a jury at the U.S. District Court for the Northern District of California in San Jose rejected arguments from Samsung and found that the company willfully set out to copy elements of Apple's iPhone when designing hardware and software for 26 of its phones and tablets.

The case, which saw Apple awarded more than $1 billion in damages, captivated the technology industry, and the appeals process is expected to be equally closely watched.

Following the case, Judge Lucy Koh considered the issue of a sales ban on the infringing Samsung products and in December ruled that a ban wasn't warranted."To the limited extent that Apple has been able to show that any of its harms were caused by Samsung's illegal conduct (in this case, only trade dress dilution), Apple has not established that the equities support an injunction," she wrote in late December.

Apple quickly appealed the decision, and that's what's set to be heard in Washington in August.

Whatever the decision, the effect on the market is expected to be limited as many of the phones are older and no longer being sold.

Since the December decision, Apple has also seen the amount of damages awarded to it reduced. Judge Koh struck about $450 million off of Apple's award, saying the jury had used a flawed method to come up with the award. She also ordered a partial retrial to determine the correct damages.